Gmail issue - but ONLY through messaging

I'm having a problem with Gmail today on my Droid X, but ONLY through the messaging client...the Gmail App on the phone is working fine and I can see my email through that. I get a message about my password being incorrect, and it surely isn't incorrect. I tried to use the automatic configuration, and also tried to manually configure the settings....but no-go. Anyone know why this happens or how to fix it?